<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			ul{
				list-style: none;
				/*overflow: hidden;*/
				/*width: ;
				height: ;*/
			}
			ul:after{
				 content:"";clear:both;display:block;height:0;overflow:hidden;
			}
			.menu > li{
				border: solid 1px red;
				width: 150px;
				height: 80px;
				float: left;
			}
			.menu .nav_menu{
				display: none;
			}
			.menu  li:hover  .nav_menu{
				display: block;
			}
			
		</style>
	</head>
	<body>
		<ul class="menu">
			
			<li>
				弹出1
				<ul class="nav_menu">
					<li>子菜单1-1
					</li>
					<li>子菜单1-2</li>
				</ul>
			</li>
			
			<li>
				弹出2
				<ul class="nav_menu">
					<li>子菜单2-1</li>
					<li>子菜单2-2</li>
				</ul>
			</li>
			
			
		</ul>
	</body>
</html>
